<!-- https://github.com/alex-shpak/hugo-book/blame/master/layouts/shortcodes/tab.html -->
{{ if .Parent }}
  {{ $name := .Get 0 }}
  {{ $group := printf "tabs-%d" .Parent.Ordinal }}

  {{ if not (.Parent.Scratch.Get $group) }}
    {{ .Parent.Scratch.Set $group slice }}
  {{ end }}

  {{ .Parent.Scratch.Add $group (dict "Name" $name "Content" .Inner) }}

{{ else }}
  {{ errorf "%q: 'tab' shortcode must be inside 'tabs' shortcode" .Page.Path }}
{{ end}}